package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper,Category> implements CategoryService {

    @Autowired
    private SetmealService setmealService;


    @Autowired
    private DishService dishService;
    /*
    *
    * 根据id删除分类，删除之前需要进行判断
    * */
    @Override
    public void remove(Long id) {

        //查询当前分类是否关联了菜品，如果已经关联，抛出了一个业务异常
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper=new LambdaQueryWrapper<Dish>();
        //添加查询条件，根据分类id进行查询
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);
        int count1 = dishService.count(dishLambdaQueryWrapper);
        // 已经关联菜品，抛出了一个业务异常
        if(count1>0){
            throw new CustomException("当前分类下关联了菜品，不能删除");

        }

        //查询当前分类是否关联了套餐，如果已经关联，抛出了一个业务异常
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper=new LambdaQueryWrapper<>();
        //添加查询条件，根据分类id进行查询
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        int count2 = setmealService.count(setmealLambdaQueryWrapper);

        //已经关联套餐，抛出了一个业务异常
        if(count2>0){
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }
        //正常删除分类
        super.removeById(id);//super的使用是因为继承了ServiceImpl,调用了父类的方法
    }
}
